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为控制北京第一热电厂除盐水系统中微生物的污堵危害,在现场进行了二氧化氯杀菌的中试及生产性试验,并与加氯杀菌作了比较。投药量为2ppm时,加二氧化氯或氯的滤柱运转周期分别为对照组的205％和122％;杀菌率分别为95～100％和85～91％。低剂量(1ppm)生产性投加,比加氯(5～6ppm)杀菌率提高50～90％,随试验时间的延长,杀菌率可提高90％以上。在不超过2ppm的高投加量下,水中的存活菌量比加氯5～6ppm时下降90～99％。在低或离剂量投加下,玻片上附着菌量分别下降90％及95％;滤料及树脂层中菌量分别下降80％及99％;挂片污垢量分别下降48％及70％;污垢中不出现硫化饮,延缓菌膜形成期一倍以上;滤池反冲沈次数比加氯时下降35％～49％;阴阳树脂交换容量分别提高14～15.5％和8～11.8％。试验表明二氧化氯的杀菌、抑制污堵效果明显优于氯,采用1～2ppm投加量即能有效控制热电厂除盐水系统中微生物的污损危害。
In order to control the fouling hazards of microorganisms in the desalinated water system of Beijing No. 1 Thermal Power Plant, pilot and chlorine dioxide sterilization experiments were conducted on site and compared with those of chlorination. Dosing rate of 2ppm, plus chlorine dioxide or chlorine filter column operating cycle were 205% and 122% of the control group; sterilization rates were 95 to 100% and 85 to 91%. The disinfection rate increased by 50-90% compared with chlorination (5-6ppm) at low dosage (1ppm), and the sterilization rate could be increased by 90% with the prolongation of test time. Under the high dosage of no more than 2ppm, the amount of viable bacteria in water is reduced by 90-99% compared with that of chlorination of 5-6ppm. The amount of bacteria attached to the glass slides decreased by 90% and 95% respectively at the low or the same dosage; the bacterial counts decreased 80% and 99% respectively in the filter and resin layers; the amount of dirt in the coupons decreased by 48% and 70% respectively; Sulfated drinks did not appear, which delayed the formation of bacterial membrane more than doubled. The number of filter recoil sinks decreased by 35% -49% compared with that of chlorination. The exchange capacity of yin and yang resins increased by 14-15.5% and 8-11.8% respectively. Experiments show that chlorine dioxide sterilization, inhibition of fouling effect was significantly better than chlorine, with 1 ~ 2ppm dosage that can effectively control the thermal power plant demineralization water system microbial detriment.